. ♪ >>> for a little over two years anne-marie slaughter headed one of america's most important jobs. >> the first thing i would say -- >> as director of policy planning at the state department, she worked extremely closely with secretary of state hillary clinton, traveling the world and providing strategic anil sis and advice on the day's most complex and urgent international issues. she was the first ever woman policy planning director. it was, she said, the job she had always wanted. >> no one is happier than i am that this day is here. >> but then slaughter just gave it up. quit. turned in her resignation letter to secretary clinton and left washington. she resumed her princeton professorship and life in new jersey with her husband and two teenage sons. in the wake of her departure, slaughter wrote a cover story for "the atlantic magazine," "why women still can't have it all." within days, the piece became the most read in "the atlantic's" history. tonight, she takes us behind that personal decision that became a raging public debate. >> explain the intensity of that kind of job,